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Plasmonic Toroidal Dipolar Response under Radially Polarized Excitation.

ABSTRACT: Plasmonic toroidal resonance has attracted growing interests because of its low loss electromagnetic properties and potential high sensitive nanophotonic applications. However, the realization in a metamaterial requires three-dimensional complicated structural design so far. In this paper, we design a simple metal-dielectric-metal (MIM) sandwich nanostructure, which exhibits a strong toroidal dipolar resonance under radially polarized excitation. The toroidal dipole moment as the dominant contribution for the scattering is demonstrated by the mirror-image method and further analyzed by Lagrangian hybridization model. The proposed toroidal configuration also shows a highly tolerant for misalignment between the structure center and the incident light focus. Our study proves the way for the toroidal plasmonic application with the cylindrical vector beams.

SUBMITTER: Bao Y

PROVIDER: S-EPMC4481838 | biostudies-other | 2015

REPOSITORIES: biostudies-other

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Plasmonic Toroidal Dipolar Response under Radially Polarized Excitation.

Bao Yanjun Y Zhu Xing X Fang Zheyu Z

Scientific reports 20150626

Plasmonic toroidal resonance has attracted growing interests because of its low loss electromagnetic properties and potential high sensitive nanophotonic applications. However, the realization in a metamaterial requires three-dimensional complicated structural design so far. In this paper, we design a simple metal-dielectric-metal (MIM) sandwich nanostructure, which exhibits a strong toroidal dipolar resonance under radially polarized excitation. The toroidal dipole moment as the dominant contri ...[more]

PMID: 26114966

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